USER MANUALPXI-6683 SeriesTiming and Synchronization ModuleThis manual describes the electrical and mechanical aspects of the PXI-6683 and PXI-6683H,and contains information concerning their operation and programming.ConventionsCaution This icon denotes a caution, which advises you of precautions to take toavoid injury, data loss, or a system crash. When this symbol is marked on theproduct, refer to the Safety Information section of the Introduction for precautions totake.National Instruments DocumentationThe PXI-6683 Series User Manual is one piece of the documentation set for yourmeasurement system. You could have any of several other documents describing yourhardware and software. Use the documentation you have as follows:• Measurement hardware documentation—This documentation contains detailedinformation about the measurement hardware that plugs into or is connected to thecomputer. Use this documentation for hardware installation and configurationinstructions, specifications about the measurement hardware, and application hints.• Software documentation—Refer to the NI-Sync Help, available at ni.com/manuals.You can download NI documentation from ni.com/manuals.Related DocumentationThe following documents contain information that you might find helpful as you read thismanual.• PICMG 2.0 R3.0, CompactPCI Core Specification, available from PICMG atwww.picmg.org.• PXI Specification, Revision 2.1, available from www.pxisa.org.• NI-VISA User Manual, available from ni.com/manuals.• NI-VISA Help, included with the NI-VISA software.• NI-Sync User Manual, available from ni.com/manuals.